This book is intended to serve as a compendium on state-of-the-art research in the field of locomotives and railroad transport. The book includes chapters on different aspects of the subject from renowned international experts in the field. The book looks closely at diesel engine locomotives and examines performance, emissions, and environmental impact. The core topics have been categorized into four groups: general topics, efficiency improvement and noise reduction, alternate fuels for locomotive traction, and locomotive emission reduction and measurement. The book offers an excellent, cutting-edge resource for researchers working in this area. The book will also be of use to professionals and policymakers interested in locomotive engine technologies and emission standards.